PARAMETER OPTIMIZATION OF MASS DAMPER CONSISTING OF COMPLIANT MECHANISM FOR BI-DIRECTIONAL CONTROL OF SPATIAL STRUCTURES

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  • TSUDA Seita
    Assoc. Prof., Faculty of Design, Okayama Prefectural University, M. Eng.
  • OHSAKI Makoto
    Prof., Graduate School of Engineering, Hiroshima University, Dr. Eng.

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Other Title
  • 空間構造物の2方向応答制御のためのコンプライアントメカニズムで構成されたマスダンパーのパラメータ最適化
  • クウカン コウゾウブツ ノ 2 ホウコウ オウトウ セイギョ ノ タメ ノ コンプライアントメカニズム デ コウセイ サレタ マスダンパー ノ パラメータ サイテキ カ

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Abstract

A new type of mass damper is presented for passive seismic response control of spatial structures subjected to bi-directional ground motions. The mass damper consists of a three-degree-of-freedom compliant mechanism with amass, three springs and a viscous damper. By utilizing the flexibility of springs, the movement of the mass is amplified in two directions and the vibration energy of the mass is absorbed by the viscous damper. The candidate parameters of the mass damper are first searched globally using a random selection of the discretized parameter values by carrying out a series of dynamic response analyses. The parameters are further optimized using a heuristic approach called tabu search. The characteristics and the effectiveness of the mass damper are discussed in comparison to the conventional tuned mass damper that has single-degree-of-freedom.

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